<template>
  <div id="">
    <!-- inline:代表的是行内表单，代表一行可以放置多个表单元素-->
    <el-form :inline="true" class="demo-form-inline" :model="cForm">
      <el-form-item label="一级分类">
        <el-select placeholder="请选择" value="" v-model="cForm.category1Id" @change="handle1">
          <el-option :label="c1.name" :value="c1.id" v-for="(c1,index) in list1" :key="c1.id"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="二级分类">
        <el-select placeholder="请选择" value="" v-model="cForm.category2Id" @change="handle2">
          <el-option :label="c2.name" :value="c2.id" v-for="(c2,index) in list2" :key="c2.id"></el-option>
        </el-select>
      </el-form-item>
            <el-form-item label="三级分类">
        <el-select placeholder="请选择" value="" v-model="cForm.category3Id" @change="handle3">
          <el-option :label="c3.name" :value="c3.id" v-for="(c3,index) in list3" :key="c3.id"></el-option>
        </el-select>
      </el-form-item>
    </el-form>
  </div>
</template>

<script >
export default {
  name: "CategorySelect",
  data() {
    return {
        //一级分类的数据
        list1:[],
        //二级分类的数据
        list2:[],
        //三级分类的数据
        list3:[],
        //收集相应一级二级三级分类的id
        cForm:{
            category1Id:'',
            category2Id:'',
            category3Id:''
        }
    };
  },
  //组件挂载完毕：像服务器发请求，获取相应的数据
  mounted(){
      this.getCategory1List()
  },
  components: {},
  methods: {
    //获取一级分类数据方法
    async getCategory1List(){
        //获取一级分裂的数据 不需要携带参数
        let result = await this.$API.attr.reqCategory1List()
        if(result.code==200){
            this.list1=result.data
        }
    },
    //一级分类select事件回调
    async handle1(){
        //当一级分类改变时，清除数据
        this.list2=[]
        this.list3=[]
        this.cForm.category2Id=''
        this.cForm.category3Id=''
        //解构出一级分类的id
        const {category1Id} = this.cForm
        this.$emit('getCategoryId',{categoryId:category1Id,level:1})
        //通过一级分类的id 获取二级分类的数据
        let result = await this.$API.attr.reqCategory2List(category1Id)
        //console.log(result)
        if(result.code==200){
            this.list2=result.data
        }
    },
    async handle2(){
        //当二级分类改变时，清除数据
        this.list3=[]
        this.cForm.category3Id=''
        //解构出一级分类的id
        const {category2Id} = this.cForm
        this.$emit('getCategoryId',{categoryId:category2Id,level:2})
        //通过一级分类的id 获取二级分类的数据
        let result = await this.$API.attr.reqCategory3List(category2Id)
        //console.log(result)
        if(result.code==200){
            this.list3=result.data
        }
    },
    handle3(){
        //解构出三级分类的id
        const {category3Id} = this.cForm
        this.$emit('getCategoryId',{categoryId:category3Id,level:3})
    }
  }
};
</script>

<style >
</style>
